Biology ETDs
Publication Date
Winter 12-11-2020
Abstract
The loss of large carnivores is fundamentally restructuring modern mammal communities. However, large carnivore removal is not exclusively a modern trend. The Pleistocene Megafaunal Extinction (PME) resulted in a near-eradication of hyper-carnivorous felids such as saber-toothed cats. However, it is unclear if smaller surviving meso-felids began to infill this ecological vacuum post-PME. I apply Ecological Niche Modeling (ENM) to test evaluate whether surviving felids filled in vacant niches post-extinction, and hypothesize that they ought to have shown increased niche-overlap patterns with mega-felids post-extinction. I model species’ fundamental niches using a multi-temporal approach, and develop a novel test to model realized niches in environmental space. I demonstrate that surviving meso-felids did not exhibit meso-carnivore release post-extinction. Niche overlap was greater than expected during the Pleistocene, yet decreased post-extinction. These findings support apex carnivores as keystone species, and suggest that anthropogenic activity is imparting ecosystem forcing on par with the PME.
Language
English
Keywords
paleoecology, biogeography, ENM, felid
Document Type
Thesis
Degree Name
Biology
Level of Degree
Masters
Department Name
UNM Biology Department
First Committee Member (Chair)
Felisa Smith
Second Committee Member
Corinne Myers
Third Committee Member
Scott Collins
Fourth Committee Member
Helen Wearing
Recommended Citation
Freymueller, Nicholas A.. "Niche dynamics of the felid guild following the Pleistocene Megafaunal Extinction." (2020). https://digitalrepository.unm.edu/biol_etds/378